package factory

import (
	"fmt"
	"net/http"
	"net/url"

	"github.com/portainer/portainer/api/http/proxy/factory/kubernetes"

	portainer "github.com/portainer/portainer/api"
	"github.com/portainer/portainer/api/crypto"
)

func (factory *ProxyFactory) newKubernetesProxy(endpoint *portainer.Endpoint) (http.Handler, error) {
	switch endpoint.Type {
	case portainer.KubernetesLocalEnvironment:
		return factory.newKubernetesLocalProxy(endpoint)
	case portainer.EdgeAgentOnKubernetesEnvironment:
		return factory.newKubernetesEdgeHTTPProxy(endpoint)
	}

	return factory.newKubernetesAgentHTTPSProxy(endpoint)
}

func (factory *ProxyFactory) newKubernetesLocalProxy(endpoint *portainer.Endpoint) (http.Handler, error) {
	remoteURL, err := url.Parse(endpoint.URL)
	if err != nil {
		return nil, err
	}

	kubecli, err := factory.kubernetesClientFactory.GetKubeClient(endpoint)
	if err != nil {
		return nil, err
	}

	tokenCache := factory.kubernetesTokenCacheManager.CreateTokenCache(int(endpoint.ID))
	tokenManager, err := kubernetes.NewTokenManager(kubecli, factory.dataStore, tokenCache, true)
	if err != nil {
		return nil, err
	}

	transport, err := kubernetes.NewLocalTransport(tokenManager, endpoint, factory.kubernetesClientFactory, factory.dataStore)
	if err != nil {
		return nil, err
	}

	proxy := newSingleHostReverseProxyWithHostHeader(remoteURL)
	proxy.Transport = transport

	return proxy, nil
}

func (factory *ProxyFactory) newKubernetesEdgeHTTPProxy(endpoint *portainer.Endpoint) (http.Handler, error) {
	tunnel := factory.reverseTunnelService.GetTunnelDetails(endpoint.ID)
	rawURL := fmt.Sprintf("http://localhost:%d", tunnel.Port)

	endpointURL, err := url.Parse(rawURL)
	if err != nil {
		return nil, err
	}

	kubecli, err := factory.kubernetesClientFactory.GetKubeClient(endpoint)
	if err != nil {
		return nil, err
	}

	tokenCache := factory.kubernetesTokenCacheManager.CreateTokenCache(int(endpoint.ID))
	tokenManager, err := kubernetes.NewTokenManager(kubecli, factory.dataStore, tokenCache, false)
	if err != nil {
		return nil, err
	}

	endpointURL.Scheme = "http"
	proxy := newSingleHostReverseProxyWithHostHeader(endpointURL)
	proxy.Transport = kubernetes.NewEdgeTransport(factory.dataStore, factory.signatureService, factory.reverseTunnelService, endpoint, tokenManager, factory.kubernetesClientFactory)

	return proxy, nil
}

func (factory *ProxyFactory) newKubernetesAgentHTTPSProxy(endpoint *portainer.Endpoint) (http.Handler, error) {
	endpointURL := fmt.Sprintf("https://%s", endpoint.URL)
	remoteURL, err := url.Parse(endpointURL)
	if err != nil {
		return nil, err
	}

	remoteURL.Scheme = "https"

	kubecli, err := factory.kubernetesClientFactory.GetKubeClient(endpoint)
	if err != nil {
		return nil, err
	}

	tlsConfig, err := crypto.CreateTLSConfigurationFromDisk(endpoint.TLSConfig.TLSCACertPath, endpoint.TLSConfig.TLSCertPath, endpoint.TLSConfig.TLSKeyPath, endpoint.TLSConfig.TLSSkipVerify)
	if err != nil {
		return nil, err
	}

	tokenCache := factory.kubernetesTokenCacheManager.CreateTokenCache(int(endpoint.ID))
	tokenManager, err := kubernetes.NewTokenManager(kubecli, factory.dataStore, tokenCache, false)
	if err != nil {
		return nil, err
	}

	proxy := newSingleHostReverseProxyWithHostHeader(remoteURL)
	proxy.Transport = kubernetes.NewAgentTransport(factory.signatureService, tlsConfig, tokenManager, endpoint, factory.kubernetesClientFactory, factory.dataStore)

	return proxy, nil
}